|Year|Total|Serbs|Hungarians|Germans|Romanians|Slovaks|
|---|---|---|---|---|---|---|
|1910|566,400|229,568 (40.5%)|108,622 (19.2%)|125,374 (22.1%)|73,303 (12.9%)|16,223 (2,9%)|
|1921|559,096|235,148 (42.1%)|98,463 (17.6%)|126,519 (22.6%)|66,433 (11,9%)|17,595 (3,2%)|
|1931|585,579|261,123 (44,6%)|95,867 (16,4%)|120,541 (20,6%)|62,365 (10,7%)|17,900 (2,1%)|
|1948|601,626|358,067 (59,6%)|110,446 (18,4%)|17,522 (2,9%)|55,678 (9,3%)|20,685 (2,4%)|
|1953|617,163|374,258 (60,6%)|112,683 (18,4%)|n/a|55,094 (8,9%)|21,299 (3,4%)|
|1961|655,868|423,837 (64,6%)|111,944 (17,1%)|n/a|54,447 (8,3%)|22,306 (3,4%)|
|1971|666,559|434,810 (65,2%)|103,090 (15.5%)|n/a|49,455 (7,4%)|22,173 (3,3%)|
|1981|672,884|424,765 (65,7%)|90,445 (14,0%)|n/a|43,474 (6,7%)|21,392 (3,3%)|
|1991|648,390|423,475 (65,1%)|76,153 (11.7%)|n/a|35,935 (5,5%)|19,903 (3.1%)|
|2002|665,397|477,890 (71.8%)|63,047 (9.5%)|908 (0,1%)|27,661 (4,1%)|17,994 (2,7%)|

Question: what was the last year that romanians were 5,5%?
Answer: 1991